LM1771EVAL

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The LM1771EVAL is an Evaluation Board by Texas Instruments designed specifically for offline switching regulator designs. It is powered by the LM1771 integrated offline power supply controller and features a large number of analog and digital integrations such as opto-isolator feedback, input and output voltage limit and short circuit protection, and transient protection.

The LM1771 is typically used for DC/DC and AC/DC (offline) switching regulator designs. This evaluation board is designed for testing the LM1771 controller and its capabilities in a real-world circuit and as a reference for design engineers. It is ideally suited for testing and evaluating offline SMPS designs on a breadboard and in prototype environments.

The LM1771EVAL evaluation board works on the principle of controlling or switching an electronic power supply based on the load current or output voltage. This principle is achieved by using a switching transformer and an integrated circuit. The integrated circuit and transformer create an oscillating circuit known as a "switched-mode power supply" or SMPS. The oscillations created by the SMPS are used to modulate or control the power to the load.

The LM1771EVAL evaluation board features an integrated flyback converter topology circuit with an adjustable output voltage range from about 0.8V to 5.25V. It also contains an opto-isolator feedback circuit for loop regulation and a dedicated Enable input. The IC is equipped with over-current protection and a unique shoot-through-prevention feature which avoids unexpected catastrophic results.

The LM1771EVAL evaluation board is equipped with a large number of other features. These include soft-start, transient protection, skip-cycle-mode and line under-voltage protection. The LM1771EVAL evaluation board also features a peak current feedback control loop for better output voltage regulation. The integrated soft-start is used to reduce the inrush current of the power supply start-up. A pre-biased output voltage loop control is also provided which consists of adjustable feedback sensing and internal peak current limit.

In summary, the LM1771EVAL evaluation board is a great tool for testing and evaluating the LM1771 controller and its capabilities in a real-world circuit. It is designed specifically for DC/DC and AC/DC (offline) SMPS designs and features a large number of integrations, protections, and features including over-current protection, transient protection, soft-start, and Peak Current Feedback Control Loop.

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